The electronic and coordination unsaturation around a metal center is very important in the development of catalysts as well as in small molecule activation. Sterically bulky ligands in metal complexes play an important role in inducing both electronic and coordination unsaturation. The ligand tri-tert-butylstannane has great potential to act as a sterically bulky ligand to create vacant sites on the metal center. The combination of platinum regents with tri-tert-butylstannane and N-heterocyclic carbene (NHC) ligand, IPr resulted in the formation of highly reactive unsaturated complex, Pt(SnBut3)(IPr)(H) with 14 electrons around the platinum center. This unsaturated complex is capable of hydrogen addition and catalysis of hydrogenation reactions at room temperature as well as inter- and intramolecular C-H activation in reversible manner. Herein we report our recent studies on the potential application of the complex, Pt(SnBut3)(IPr)(H) in catalysis of hydrostannylation reactions exhibiting high product selectivity. Based on our results, a mechanism is proposed for the hydrostannylation of trimethylsilylacetylene, Me3SiC≡CH which selectively produces the trans isomer in quantitative yields. The product and the two intermediates in the catalytic cycle were isolated and successfully characterized using a combination of X-ray diffraction and NMR spectroscopy. This study shows potential of tri-tert-butylstannane to act as both a bulky ligand and a reagent in the catalytic cycle. The catalytic ability of the complex, Pt(SnBut3)(IPr)(H) is not limited to a certain reaction type. Therefore, this study proves that the potential of the complex, Pt(SnBut3)(IPr)(H) in different catalytic systems is at large.

Catalytic hydrostannylation by electronically unsaturated complex containing platinum and tin, Pt(SnBut3)(IPr)(H)

2019 Spring National Meeting

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